CN101354445A

CN101354445A - Optical fiber grating sensing mine safe monitoring technique with novel anchoring rod as sensing medium

Info

Publication number: CN101354445A
Application number: CNA2007101301260A
Authority: CN
Inventors: 宋波
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-23
Filing date: 2007-07-23
Publication date: 2009-01-28

Abstract

The invention provides a fibre grid sensing mine safety monitoring technique which uses a novel anchor rod as sensing medium; the fibre grid is used as information transmission medium; simultaneously, the anchor with a concave trough is used for encapsulating and protecting the fibre grid so as to solve the problems of moist metal mine environment and severe condition; a round ring is welded at a position which has a certain distance away from the end of the anchor rod so as to protect the fibre grid sensor against the damage of external force. The safety of the mine is improved and the safe production of the mine is ensured by analysing the transmission data and monitoring the mine. The technique of the invention has the advantages of high precision, strong anti-interference capability, low cost, high automatic integration level, being convenient for arrangement and installation, simple operation, remote monitoring and long-term monitoring and the like.

Description

With the novel anchor rod is the optical fiber grating sensing mine safety monitoring technology of sensing media

Affiliated technical field

The present invention relates to a kind of modern mine safety monitoring technology, specifically fiber grating sensing technology is applied to the mine safety monitoring.

Background technology

Mine industry is the basis of other industrial trade development, and therefore, the mine produces the considerable effect of bringing into play of social progress and national economy.The main both at home and abroad safety monitoring or the technological approaches of early warning and method find that the whole bag of tricks is very strong to instrument or the device dependence with a certain special purpose, belong to traditional safety monitoring technology means basically.Generally have such deficiency: the efficient of monitoring is not high, is only applicable to part safety monitoring among a small circle; Reliability of data transmission and anti-interference are not strong, particularly under the environment of such natural conditions of underground mine extremely abominable (extremely moist, dust concentration is big and electrical source of power shakiness etc.) and operating mode complexity (the ambient vibration reciprocal effect that multiple factors such as explosion, mining operations and vehicle ' cause); The robotization integrated level of monitoring system is not high, can't satisfy the requirement of continuity and remote monitoring.For this reason, be badly in need of a kind of precision height, error is little, cost is low, permanance is high, the life-span is long, the monitoring technology that can carry out the remote monitoring long term monitoring remedies these defectives, improves the security in mine, ensures the safety in production in mine.

Summary of the invention

In order to overcome the deficiency of traditional monitoring technological means, the present invention is to be sensing media with the recoverable anchor pole, anchor pole is squeezed in the middle of the rock, with strained situation that is packaged in the sensor monitors rock in the anchor pole and blasting vibration data, by data are analyzed, the mine is carried out the technology of safety monitoring.The problem that the invention solves traditional monitoring technology poor anti jamming capability, error is big, efficient is low, the robotization integrated level is low, can't carry out remote monitoring.

The present invention uses optical fiber as media, robotization integrated level height; As carrier, energy anti-electromagnetic interference (EMI), anti-lightning strike is so have good antijamming capability with light signal; The material of fiber core is a silicon dioxide, so Fibre Optical Sensor is corrosion-resistant, long service life, permanance height, so can carry out long term monitoring to the mine; Optical Fiber Transmission distance, precision height, thus can to carry out remote monitoring on the ore deposit and error little.In addition, as sensing media, so cost is low with the recoverable anchor pole in the present invention.

The present invention is packaged in fiber-optic grating sensor in the anchor pole, has protected fiber-optic grating sensor effectively, but sensor does not directly contact with rock, so monitoring accuracy and monitoring effect have become key.By the indoor static experimental study, show: during rock generation strain, be bumped into the strain that the sensing media of rock interior can be more or less the same accordingly, and in the crack developing process, can well express the rock strain value.Thereby conduct to monitoring instrument and show intuitively by being pasted on foil gauge on the sensing media again.The result of indoor static test has effectively supported the static site test of optical fiber, based on the indoor static result of experiment, at the scene in the optical fiber envelope test, as the anchor pole of sensing media squeeze into to monitor rock after, within a certain period of time by monitoring the strain value of sensing media anchor pole, the strain value of rock in the monitoring certain limit carries out long-term monitoring to the distortion situation of rock in the monitoring range and finally reaches the roof fall side falling accident in the monitored area is carried out safety monitoring thereby reach.

The invention has the advantages that: (1) can carry out remote monitoring; (2) precision height; (3) antijamming capability is strong; (4) can carry out long term monitoring; (5) cost is low; (6) robotization integrated level height; (7) be convenient to lay installation, simple to operate.

Description of drawings

The present invention is described in detail below in conjunction with drawings and Examples:

Fig. 1 is an anchor pole processing synoptic diagram, and wherein 1 is shaft; The 2nd, groove, the 3rd, supporting plate is not damaged by external force with the protection fiber-optic grating sensor; The 4th, spiral thread on anchor bolt; The 5th, the anchor head of anchor pole;

Fig. 2, Fig. 3 are the detail drawings of supporting plate, and middle sky need not be made screw thread, and directly punching gets final product;

Fig. 4 is anchor bolt construction form figure;

Fig. 5 is the stress strain diagram of sillar and aluminium bar, and wherein horizontal ordinate is a pulling force, and ordinate is microstrain, and what side's point connected is the stress-strain diagram of aluminium bar, and it is the stress-strain diagram of sillar that round dot connects.

Embodiment

By the indoor static test, draw stress one strain figure 5 of last sillar and sillar and aluminium bar, show that monitoring accuracy of the present invention meets the demands.The position that placement sensor is at first wanted in dynamic security monitoring is carried out in the mine, should follow following principle during position: the validity principle, at many levels monitor principle, based on the principle of geologic condition, preferentially emphasis is monitored the principle, noiseless or disturb the principle of principle, economical rationality less of key point.Secondly, the sensing media anchor pole is processed, because the complicacy of site environment, sensor can not directly be arranged in the outside of anchor pole, need carry out certain packaging protection to sensor, so must carry out certain processing to meet the demands to anchor pole.Anchor pole mills the groove of an appropriate size along axis direction, is used for the arranged light gate sensor, is arranged in the anchor pole afterbody; Because the angle of Fibre Optical Sensor bending requires and considers mechanical action situation when anchor pole is squeezed into, not damaged by external force at annulus of the terminal a distance welding of distance anchor pole with the protection fiber-optic grating sensor.In addition, consider matter of time, be preferably in the hole of just accomplishing fluently testing requirements before testing in advance,, raise the efficiency to save time.Anchor structure figure as shown in Figure 1.Promptly carry out the encapsulation of grating after the anchor pole completion of processing.Grating is arranged in the groove of anchor pole in order to the strain of monitoring anchor pole.Grating is sticked in the groove of the anchor pole of having processed with epoxy resin glue, make it can be even as far as possible, do not produce local stress, guarantee the monitoring initial value of grating.After having pasted grating, the anchor pole that processes is placed a period of time, treat that the stable back of glue measures the encapsulation situation of grating, and with the factory-said value of grating relatively.And then anchor pole squeezed into the position, monitoring point.Guaranteeing under the safe situation, before the explosion monitoring instrument is being installed in appointed positions.Monitoring instrument in the connection, and carry out preliminary debugging at the scene, after all are normal, withdraw the scene.After the explosion, the instrument and equipment dismounting is carried to the safe place, immediately test data is carried out analyzing and processing with ore deposit under the staff.

Claims

1. a mine safety monitoring technology is characterized in that: be the media of transmission information with the fiber grating, with anchor pole fiber grating carried out packaging protection simultaneously.

2. anchor pole according to claim 1 is characterized in that: anchor pole mills the groove of an appropriate size along axis direction, is used for the arranged light gate sensor, and the axial length of groove should be decided according to fiber lengths.

3. anchor pole according to claim 1 is characterized in that: not damaged by external force apart from annulus of the terminal a distance welding of anchor pole with the protection fiber-optic grating sensor.